The hardness-flow stress correlation in metallic materials
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Hardness is a measure of the resistance of a material to indentation and a wide variety of indentation tests have been devised to measure the hardness of materials. In the case of hardness tests which utilize spherical balls as the indentor, it is also possible to derive flow stress-strain relationships from hardness tests carried out either over a range of loads (static test) or over a range of impact velocities (dynamic test). This paper first describes the experimental procedure for obtaining stress-strain curves from hardness tests. In addition, the paper also analyzes in detail, the indentation test conditions under which the conversion of the hardness-average strain data to flow stress-strain data is simple and straightforward in the sense that the constraint factor which is the correlating parameter for the above conversion is not only independent of strain but also easily computable on the basis of known mechanical property data of the test material.
KeywordsHardness-flow stress static hardness dynamic hardness impact velocity constraint facto Meyer hardness
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- Francis H A 1976J. Eng. Mater. Technol. Trans. ASME 98 272Google Scholar
- Johnson K L 1985Contact mechanics (UK: Cambridge University Press) Chapter 6Google Scholar
- O’Neill H 1967The hardness of metals and alloys (London: Chapman and Hall)Google Scholar
- Tabor D 1951The hardness of metals (Oxford, UK: Clarendon Press)Google Scholar
- Tirupataiah Y and Sundararajan G 1991bMetall. Trans. A22 2375Google Scholar